Originally Posted by
HTupolev
If we go by data measured from bicyclerollingresistance, 25mm Gatorskins have a Crr of .00659 at 80PSI, and 25mm GP5000s have a Crr of .00363 at 80PSI.
Let's go back to the examples earlier, with the 80kg cyclist with a CdA of .32 doing 20mph at 168W. If we swap his tires out to those GP5000s, that total drops to 165W. If we then swap in the Crr for the Gatorskins, how fast will he be going at 165W? It turns out to be about 19.06mph, so nearly 1mph slower.
Cycling Physics Calculator
Plugging in this data for a 75 kg rider doing 100 miles at an average 200 watts using the above two tires with a CdA of 0.35
The time difference in completing that 100 miles is....
11 minutes and 10 seconds.
For 50 miles:
5 minutes and 35 seconds.
Maybe Oleg can't change his tire in 5 minutes and 35 seconds and that's the cause of his consternation?